Moon jellies have an unusual self-repair strategy, scientists have learned. If one of these young jellies loses some limbs, it simply rearranges what's left until its body is once again symmetrical.
"We were not expecting to see that," says Michael Abrams, a graduate student in biology at the California Institute of Technology.
All creatures have tricks to heal themselves. If you get a cut, your skin will form a scar. And some sea creatures, like starfish and sea cucumbers, can regenerate lost body parts.